Adjustable thread cutter



um. s, 1924. 1,479,911

E R. H. HARPER A ADJUSTABLE THREAD CUTTER Filed July '7. 1921 Fatented dan. t3, 192520 entren REU'BEN H. HARPER, OF CHICAG, ILLINOIS.

ADJUSTABLE THREAD CUTTER.

Application filed July 7,'

To all whom 2 may concern.'

Be it known that l, linUnnN H. HARPER, a citizen oi? the United States,v residing at Chicago, in the county ot Cook and State ot Illinois7 have invented certain new and useful Improvements in an Adjustable Thread Cutter, of which the following is a speciiication.

This invention relates to a threading tool which is adapted to be used :tor separately cutting a number of different threads with the same tool. One of the principal objects ot the invention is to provide improved means 'for setting the tool to make a light or a deep cut, and to vary the adjustment so that threads of different sizes but oi' the same pitch can be cut with the same dies. A further object of this invention is to provide improved means for connecting the sections of the tool. A still further object is to provide a construction which can be folded in compact form.

In the accompanying drawing, Fig. 1 is a plan view of a tool constructed in accordance with the principles of this invention; Fig. 2 is a section taken on the line 2 2 of Fig. 1; Fig. 3 is an end View; Fig. t is an enlarged view with part broken away showing the adjustment at the hinged end of the tool; and F ig. 5 is a view showing the adjustable locking means at the other end of the tool.

This tool comprises a pair ot members having co-acting die faces on opposite sides oi each member, the corresponding pairs ot which may be brought together by a pivotal mounting at one end and locked in position' by an adjustable clamping device at the other end. In order to set the c'o-acting die faces, a careful adjustment oi the members is necessary and the adjustment must be in a parallel direction. lt is therefore necessary to provide an adjustment in the hinge and also an adjustment in the clamping device.

Treterring more particularly to the drawings, a pair ot members 1 and 2 are connected at one end by a hinge 15 and at the other end by a clamping device el. In the opposite v edges of each member are recesses tor seating co-acting die plates 5 and 6, and 'T and 8. Either pair of dies maybe brought into co-acting engagement by rotating 'the :members 1 and 2 about their hinge.

At the opposite ends ot the members 1 and 2 are slotted projections v9 with a cou- Serial No. 483,107.

pling 10 pivoted therein which has a short threaded stem 11 upon which a handle 12 may be secured. When the handle is threaded up tight against the outside o the projections 9, as shown in Fig; 1, it is in position for use,but by backing the handle off on the threaded stem. the handle 12 and its coupling 10 may be rotated to the broken line position 12aL and then the handle is threaded up against the inside of the projections 9 for folding the tool compactly.

in the corresponding edges of the members are alining pins 13 and recesses 14 :tor receiving them.

The corresponding ends of the members 1 and 2 are slotted to receiveI a hinge plate or link 15, or a plurality of plates to make up the desired thickness, and in this plate is an opening 16 to receive a threaded membei.' 17 which has ahead 18 with a transverse hole 19 to receive a pivot screw 2O which extends through the slotted end of the member 1. An adjusting nut 21 is mountedl on the member 17 and adjusts the position ot the pivot screw 2O with respect to the link 15. Another pivot screw 22 directly connects the link 15 with the member 2.

In the opposite edges of the link 15 adjacent the adjustable end are graduated marks 23 which register with a. pointer 2li in the member 1 formed by boring two holes v25 close together, so that they partially overlap and by counter-boring the upper edges ot these holes to make the extremity of the pointer'more distinct. With this graduation and pointer itis possible Kto make a very close adjustment of the hinged end ot the tool. ln tact7 this enables the tool to be set for a deep or a slight out as desired7 orto cut a thread of the sainey pitch upon inembers of.' diii'erent sizes, within the limits of the graduation. y V

The clamping device comprises an apertured link 41- pivoted to a. projection 25 on one ot the members and extending over a projection 26` on the other one. Between the projections is a partition27 through which a bearing pin 28 extends loosely having a head 29 at one end to'engage one side ot' thel projection 26, and an enlargement `30 at the other end to prevent the disengagement of the pin, and a spring 31 tending to torce the head into engagement with the vprojection 26. At the outer end of the link is an adjusting screw 32 which may be threaded inwardly against the opposite face tion 34- is made in the edge ot the member 2 so that the clamping device maybe adjusted to correspond with the hinged adjustment at the other end.

l/'Vith this construction :it is .obvious that the tool may be accurately set not only for diii'erent depths oi' cut for. thesame thread,

ydifferent diameters oit thread'.

but also ior threads ot., the same. pitchand The adjiistment. may be, made quickly and easily, and in order to change theftooltf.) usethe oppoe ,site set dies .it is neeessaryV only to"release the clamping device byturiiing. the screw or pressing the ymember 2 inwardly, at,

this end, to swing. the vclamping device out.

ci engagementv with the projection 2G and to swing the members `l and .2A about. their hinge until theother set 4ott dies is brought into co-acting position.

l claim: v i l. f! thread. cutter. comprising a pair ot .members having co-actiiig die vtaces on op- ...posite sides and a pivotalconneetion tor one y end otsaid. members, and means including a.

. part of said'l pivotalconnection for regulating the separation ot the. members, said:

i. means ,comprising an adjusting nut and screw and Ja link in Which they are movable.. 2. A thread cutter. comprising a paii` or,

members having die faces on opposite sides,

anda .screyvthere'for seated in the recess in .the plate andthescreyv..pivoted tothe otherv member.

...there'fcrseated in the .slots ofthe extrem.- ities anddirectly pivoted toone ci the lmemf.iiiembei's.and movable .lengthwise in. the.

hinge by the rotation ot theniit, the `slotted portions oi the members retaining the not.

,. and-:screw inthe hinge.

2.The combination in a. thread cutting tool, yo'a-jfiair of members having opposite .cofacting faces, a hiiwe.,theretorcompris .j ing an apertured plate attached to.. one ot' lthe members. and anad-jnstingnut and screw v.movable in the aperture or" the plate. and attached to tlie'othei. membenand anadjustable. clamping. means for therends ofv the members opposite thehinge.

5,v :Thefcombination with a V.pair ojl?v meni- .bers .having coacting die faces onopposite sides, ,ot an adjustable hinge therefor coniprising an apertured plate -pivoted to one of the members, the adjusting nut and screw movable in the aperture and the screw pivoted to the-other-'meniben means for holding the members parallel to each other, and a clamp ing device opposite the hinged ends of the membersadapted to vary the distance apart of the members at this end.

6. In a tool rof the-classY described, al pair of members having adjustable hinge connection at one end, means for holding the-.inembers parallel for moving them 'orivard and from each other, and an adjustable clamping device for the device at the ends opposite .the hinge, said clamping device comi'irising an apertured linkhinged to one ot the inembers and extending over a projection oit the other, a springpressed abutment .to-,engage oneside ot' the proj ectionrand the adjusting .screw to engagetheother side ot the. projection.

7. In a hingedtool, a pair oi members, a hinged plate pivoted to one of thefmembers, means forming.V any adjustable connection movable.. withl respect tothe .plate andI pivoted tothe other member, graduations on opposite.. sides ofv the .hingeplata and a pointer on. the. member to which thehinge plate is notv4 directly pivoted. corresponding to the graduations at the sides ofthe. hinge plate. l

8. A. tool ,comprisinga pair o'tmembers .having co-acting die :faces on oppositesides an adjustable .hingei therefor fcomprising a vplate directlyy pivoted to one of. tlie-,;inem- ,a plate pivoted toone ot the members and, L. having a .recessethereim an adjusting nut@v bers, and means nio-.vable With respect to the plate and pivotallyonnected tothe other membengraduations oni opposite sides. of the Vplate' .at theend Which visnot directly-.piv-

oted to one of the members, and `agpeepsight Vhaving projection. therein Vforming .a pointer in the ,member toavhich thel plate is. not pivotallyconnected, tlieipointer corresponding tothegraduations on eithersside or" the plate forthe adjustment `ot themenibers for either-pair oi coasting die faces.

9. i-"i. .tool comprising` apair otmembers. having (no -actingdie AYfaces en oppositesides, an adjustable `hinge .at one end otltheinemfbers, aclamping device at theothcrrnd of the members, and a pair of :foldable handles tor the members ,comprising an upstanding slotted portion at one end of each member` a `couplingpivotallyconnected therein, and a handlethreaded npoiiwthe .coupling and movable vthereon Yagainst,eithenV side of the projection, extending.4 from.. the.-z member when abutting thebutside ofthe projection and. er:tendingoverl themember in compact REUBEN H. HARPER. Y 

